BMI Calculator
Calculate your Body Mass Index instantly. Enter your weight and height to see your BMI and health category.
Files processed in your browser — never uploaded to our serversBMI is a screening tool, not a diagnostic measure. Consult a healthcare professional for medical advice.
Frequently Asked Questions
Body Mass Index (BMI) is a measure of body fat based on height and weight. It is calculated by dividing weight in kilograms by the square of height in meters. BMI is used as a screening tool to indicate whether a person may have a weight problem.
For most adults, a BMI of 18.5–24.9 is considered healthy. A BMI below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese. However, BMI is a screening tool and does not directly measure body fat.
BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat, and may not be accurate for athletes, elderly people, or during pregnancy. Use it as a general indicator, not a medical diagnosis.
BMI = weight (kg) ÷ height² (m²). For example: 70 kg ÷ (1.75 m)² = 70 ÷ 3.0625 = 22.9. In imperial units: BMI = (weight in lbs × 703) ÷ height² (in²).